... by customer when ordering.3) Output: 2-3 alarm output, act as 3-phase under-voltage/lacking ... and ampere input isolation, high anti-interference;5) Comunication: RS232/RS485 interface, MODBUS RTU ... Temperature Controller, Digital Adjustor,thermocouple (TC and RTD), Panel Meter, Sensor Meter, inductor, Power Meter, Coulometer, Voltage Meter, Ampere Meter, Counter, Tacho Meter, Frequency Meter, ...